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Recent questions tagged relative-velocity

A bus is moving with a speed of $10 m/s$ on a straight road. A scooterist wishes to overtake the bus in $100 s$. If the bus is at a distance of $1 \;km$ from the scooterist with what speed should the scooterist chase the bus?

asked Jul 3, 2013 by meena.p

1 answer

Two trains each having speed $30 km/hr$ are leading towards each other on the same straight track. A bird can fly at $ 60 km/hr$ flies off one train when they are $60 km$ apart and heads directly for the other train. On reaching other train it files directly back to first and so on. How many trips can the bird fly from one train to another before the trains crash?

asked Jul 2, 2013 by meena.p

1 answer

An elevator car whose floor to ceiling distance is 2.7 m starts ascending with constant acceleration of $1.2 m/s^2$ after 2 seconds of the start a bolt begins falling from ceiling of elevator. What is the time after which the bolt hits the floor of the elevator.

asked Jun 27, 2013 by meena.p

1 answer

$v_A=(x \hat i+6 \hat j) m/s,v_B=(3 \hat i+2 \hat j) m/s$ find x such that the relative speed of A with respect to B becomes 5 m/s

asked Jun 25, 2013 by meena.p

1 answer

A 150 m long train is travelling from West to East at a speed of 20 m/s. A bird is flying from East to West at a speed of 5 m/s above the train. How long will the bird take to cross the train ?

asked Jun 20, 2013 by meena.p

1 answer

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